Bump react/promise from 2.8.0 to 2.9.0

Bumps [react/promise](https://github.com/reactphp/promise) from 2.8.0 to 2.9.0.
- [Release notes](https://github.com/reactphp/promise/releases)
- [Changelog](https://github.com/reactphp/promise/blob/2.x/CHANGELOG.md)
- [Commits](reactphp/promise@v2.8.0...v2.9.0)

---
updated-dependencies:
- dependency-name: react/promise
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]